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Valley Roller FAQ


FAQ

What markets does Valley Roller serve?

Embossing, Converting, Paper Making, Plastics, Graphic Arts, Laminating, Corrugated,
General Industrial Applications.

How does Valley Roller differentiate itself from the competition?

Technically driven organization. Intimate knowledge of end-use applications coupled with knowledge of rubber chemistry. Strong manufacturing expertise.

Why are rolls covered with elastomeric coverings?

Rolls are covered with elastomeric coverings to allow the creation of a uniform pressure zone called a "Nip". An effective covering will remain stable in the given operating environment. This means the uniform pressure will not change when the covering is exposed to chemistry, heat and pressure.

How do you select the best covering for an application?

Definition of operating environment is the first step. What is the roll exposed to?
Chemistry, Speed, Pressure and Temperature are typically factors that must be taken into consideration.

What is the best hardness covering for my application?

Typically this is defined by the application environment. The desired nip width has a great deal of impact on the hardness of the covering. Normally this has been designed by the respective equipment manufacturer. Incremental improvements in a given environment can be achieved by fine tuning the respective covering hardness.

What elastomeric coverings can Valley Roller Supply?

Valley Roller offers a full range of elastomeric coverings including: NBR, XNBR, NBR/PVC, EPDM, Hypalon®, Neoprene, Silicone, Fluoroelastomer, SBR, Natural Rubber, Epoxy,
Ceramic. These coverings have been fine tuned for each application to optimize overall roll performance.

What are Valley Roller's roll size capacities?

Minimum Diameter: .250" Maximum Diameter 40.00"
Minimum Face Length: 2.00" Maximum Face Length 400.00"
Crowning: 0-.300" Single Parabolic or Complex Crowns
Maximum Weight: 20,000 Pounds

What physical properties are important for roll applications?

The most interesting aspect of the roll industry has to do with the diversity of roll applications. It cannot be emphasized enough the most important physical property in a given application is difficult to define since applications vary so much. Each roll application has it own inherent operating parameters that must be met for a covering to function properly.

What is a Nip?

A focused and controlled energy force that take into account time, force and tension.
A Nip is uniform pressure zone that is created between two parallel roll surfaces, typically one compliant and one non-complaint surface.

In most applications the "Nip" width creates the desired degree of friction. An effective "Nip" will remain stable in the given operating environment. This means the compliant covering used to create the uniform pressure will not change when exposed to chemistry, heat and pressure.

What is deflection?

The elastic bending of a roll due to gravity, tension, and nip which determines the appropriate diameter of the roll. Engineering calculations can be done to determine the amount of deflection in a given application. This can be accomplished through static nip impressions.

How can deflection be eliminated?

Crowning will eliminate deflection. Improper crowns can cause the substrate to foldover, and wrinkle and impact the drive in an end-use applications.

What is the importance of balance?

The center of axis of a roller must lie along the axis of rotation. Imbalance causes premature excessive wear of machine parts. It can cause uneven wear and rolls to heat-up in service. Imbalance forces soar as machine speeds increase.

What are the most significant roll operating parameters?

The most significant operating parameters are Application Chemistry, Speed, Temperature, Pressure , Roll Geometry, Deflection, Balance and Coefficient of Friction.

What technical support can Valley Roller provide?

Technical support consists of the following problem solving activities:
Chemical Compatibility Testing, Nip Impressions, Core and Covering Design, Co-efficient of Friction Enhancements, Web Compliance Support, Designing Spares and General Process Improvement.

 
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© Copyright 2011 Valley Roller Company

WISCONSIN
N257 Stoney Brook Road, Appleton, WI 54915-9444
Phone: (920) 733-1991 | Fax: (920) 733-3722

TEXAS
101 Sentry Drive, Mansfield, TX 76063
Phone: (817) 453-8950 | Fax: (817) 453-1501